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18TH STREET PEDESTRIAN IMPROVEMENTS 3741 RMT July 03, 2024 46 1 Sand Slurry: For cracks that are to be filled with sand slurry, thoroughly mix the 2 components and pour the mixture into the cracks until full. Add additional CSS-1 cationic 3 emulsified asphalt to the sand slurry as needed for workability to ensure the mixture will 4 completely fill the cracks. Strike off the sand slurry flush with the existing pavement 5 surface and allow the mixture to cure. Top off cracks that were not completely filled with 6 additional sand slurry. Do not place the HMA overlay until the slurry has fully cured. 7 8 The sand slurry shall consist of approximately 20 percent CSS-1 emulsified asphalt, 9 approximately 2 percent portland cement, water (if required), and the remainder clean 10 Class 1 or 2 fine aggregate per section 9-03.1(2). The components shall be thoroughly 11 mixed and then poured into the cracks and joints until full. The following day, any cracks 12 or joints that are not completely filled shall be topped off with additional sand slurry. After 13 the sand slurry is placed, the filler shall be struck off flush with the existing pavement 14 surface and allowed to cure. The HMA overlay shall not be placed until the slurry has 15 fully cured. The requirements of Section 1-06 will not apply to the portland cement and 16 sand used in the sand slurry. 17 18 In areas where HMA will be placed, use sand slurry to fill the cracks. 19 20 In areas where HMA will not be placed, fill the cracks as follows: 21 22 1. Cracks ¼ inch to 1 inch in width - fill with hot poured sealant. 23 2. Cracks greater than 1 inch in width – fill with sand slurry. 24 25 Hot Poured Sealant: For cracks that are to be filled with hot poured sealant, apply the 26 material in accordance with these requirements and the manufacturer’s 27 recommendations. Furnish a Type 1 Working Drawing of the manufacturer’s product 28 information and recommendations to the Engineer prior to the start of work, including the 29 manufacturer’s recommended heating time and temperatures, allowable storage time 30 and temperatures after initial heating, allowable reheating criteria, and application 31 temperature range. Confine hot poured sealant material within the crack. Clean any 32 overflow of sealant from the pavement surface. If, in the opinion of the Engineer, the 33 Contractor’s method of sealing the cracks with hot poured sealant results in an excessive 34 amount of material on the pavement surface, stop and correct the operation to eliminate 35 the excess material. 36 37 5-04.3(4)A2 Crack Sealing Areas Prior to Paving 38 In areas where HMA will be placed, use sand slurry to fill the cracks. 39 40 5-04.3(4)A3 Crack Sealing Areas Not to be Paved 41 In areas where HMA will not be placed, fill the cracks as follows: 42 43 A. Cracks ¼ inch to 1 inch in width - fill with hot poured sealant. 44 B. Cracks greater than 1 inch in width – fill with sand slurry. 45 46 5-04.3(4)B Vacant 47